RU2004649C1 - Knitting machine thread feed device - Google Patents

Description

The invention relates to knitwear production and can be used on knitwear machines for the manufacture of elastic interlock and combined weaves, as well as weaving with different yarn consumption in different knitting systems.

A device for feeding a thread for a knitting machine is known, comprising a drive pulley mounted on a shaft and a thread feeding drum, consisting of two flanges detachably mounted on the shaft, each of which has concentric annular grooves, the number of which corresponds to the number of thread feed speeds and located between the flanges in corresponding opposite grooves of the elastic tape forming the thread-feeding surface of the drum. The device comprises a yarn spreader motionlessly mounted relative to the feed drum, made of two parts, of which the upper part is located at an acute angle to the axis of rotation of the drive shaft, and the lower part is parallel to this axis and has a hook for guiding the thread.

The device operates as follows.

The thread from the bobbin bobbin passes through the guide eye and is wound onto a rotating thread feeding drum. At the same time, from the opposite side of the winder, the thread is wound from the drum through a guiding hook and enters the yarn guide in the clamping system. Each of 8-10 turns of thread spans a rotating drum and a fixed spreader. The upper 2-3 turns cover the inclined part of the spreader, the rest are located on its vertical surface. During operation of the device, these upper 2-3 turns exert constant pressure on the lower turns and shift the latter downward, freeing up space for winding the upper turn.

A disadvantage of the device is its limited use on the machine, since it does not provide a feed rate independent of other devices. In addition, changing the diameter of the thread feeding drum requires considerable time and partial disassembly of the device, which creates inconvenience in service,

The closest in technical essence and the achieved effect in relation to the claimed device is a device equipped with a thread feeding drum for feeding the thread into the knitting system, containing two flanges equipped with

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grooves made spiral with the opposite direction and uniformly spaced on opposite planes in which the elastic band is located. Both flanges are connected integrally with the elastic tape and secured to the drum by means of a slider fixed in 3 positions. The device comprises a thread guide arranged motionlessly relative to the thread feeding drum, made of two parts, of which the upper part is located at an acute angle to the axis of rotation of the drive drum, and the lower part is parallel to this axis and has a hook for guiding the thread.

The device operates as follows.

Before starting the thread feeding device, 8-10 turns of thread are manually wound on each thread feed drum and the thread spreader. When threading the thread, the slider moves from the first fixed position, which provides a fixed connection of the flanges, the elastic band and the shaft with the drive pulley to the second fixed position, in which the drum receives the freedom of rotation relative to the shaft necessary for threading the thread. If necessary, change the diameter of the drum, the slider moves to the third fixed position, in which the upper and lower flanges are disengaged. The elastic tape, held together with the fingers along the lower flange with small reciprocating angular rotations, moves along the spiral grooves of the drum, decreasing or increasing the diameter of the thread-feeding surface of the drum. After reaching the required diameter by moving the slider to the first fixed position, both flanges, the elastic tape again form a fixed connection with the shaft. When the knitting machine operates, the thread from the bobbin bobbin passes through the guide eye and is wound onto a continuously rotating drum.

At the same time, from the opposite side of the winder, the thread is wound from the drum through a guiding hook and enters the yarn guide in the clamping system. Each turn of the thread spans a rotating drum and a fixed thread spreader. The windings of thread wound around the drum under the action of the upper inclined part of the guide are constantly moving down, freeing up space on the drum to wind the next winding.

However, the device described above does not provide accurate control of the filament feed rate, since the forming

the thread feeding surface of the drum is made in a spiral about the axis of rotation. In addition, it is not convenient enough to maintain, especially when refueling, and to eliminate malfunctions due to the presence of a fixed thread spreader installed next to a rotating low-feed drum. The friction of the rotating coils of the thread together with the thread feeding drum with respect to the fixed surface of the yarn spreader causes a violation of its shape, delamination into individual fibers and a decrease in strength.

It is an object of the invention to increase the accuracy of controlling the feed rate of a thread, while also improving ease of maintenance.

This object is achieved in that the yarn feed device for a knitting machine comprises a drive pulley fixed to the shaft and a yarn feed drum configured to change diameter and comprising two flanges, the yarn feed surface of the drum being formed by rods, each of which has its own axes mounted in the first and second flange, and between the flanges mounted coaxially with the shaft with the ability to rotate and fix the disk, equipped evenly with grooves placed around the circumference, in each of which ene rod.

This goal is also achieved by the fact that each of the connecting rods has two inclined sections to the axis of rotation of the drum (with an inclination angle of less than 90 ° and less than 2 °), as well as the fact that the grooves in the disk have, for example, the shape of an Archimedes spiral, and the disk is equipped with a cylindrical section for a smooth exit of the thread from the drum.

Signs distinguishing the claimed device from the prototype device were not found in other technical solutions that characterize them. as substantial.

Fig. 1 shows a general view of the yarn feeder for a knitting machine: Fig. 2 is a view aa in Fig. 1; Fig. 3 is a diagram of the interaction of one of the grooves of the disk with the connecting rod.

In accordance with the drawings (Fig.1,2,3), the device consists of a housing 1, in which it can rotate on bearings

2 mounted shaft 3. At the upper end of the shaft

3 stationary using a pin 4, a drive pulley 5 is installed, which interacts with a perforated drive belt 6. At the opposite end of the shaft 3, flanges 8.9 are installed motionlessly with a pin 7, equipped with uniformly spaced ON CIRCLE. 1 in which the axle rails are mounted 7. 13, connecting rods 14 in the amount of 10 12 pieces The connecting rods 14 in their upper part are equipped with 5 inclined section 15. located to the axis of rotation of the drum under the reference 90 °, designed to lay the threads on the thread surface of the drum and plot 16 comprised between the drum axis vresche0 audio angle / of 1 -2 °. designed to accommodate 8 to 10 turns of thread. Section 16, the lower part, interacts with the groove 17 of the disk 18, mounted coaxially with the shaft 3, between the flange 9 and the spring washer 19. The spring washer 19 provides friction force motion of the connection of the disk 18 with the flanges 8.9 during the operation of the device, in turn, the disk 18 With the help of the grooves 17, the connecting rods 14 are immovable relative to the flanges 8.9. At the same time, the spring washer 19 allows the hand 18 to rotate the disk 18 by the necessary force to change the diameter of the thread-feeding drum with a stopped hand.

The disk 18 is equipped with a cylindrical section 20 for a smooth exit of the thread from the drum. In order to reduce the pressure angles of the grooves 17 on the tuna 14, the grooves are made, for example, in the form of an Archimedes spiral and are evenly spaced around the circumference of the disk 18. The number of grooves 17 is equal to the number of connecting rods 14. The device is equipped with guide eyes 21, 22, 23, 24 for thread 25,

5 with a disc brake of the thread 26 by the machine stop lever 27 when the thread 25 is broken at the entrance to the device and by the machine stop lever 28 when the thread is broken at the device exit. The device is screwed onto

0 ring 29 of the machine using the groove 30 on the housing 1. On the lower plane of the disk 18, a reference point of the diameter of the drum can be plotted, and on the lower plane of the flange 9, risks and numbers are indicated

5 required drum diameter (not shown).

The device operates as follows

Thread 25 from a bobbin located on

0 the bobbin of the machine, it is tucked into the guide eye 21, the disk brake 26 passes and, bending the lever 27 for stopping the machine lying on it, when the thread is seated at the entrance to the device, the upper part of the drum formed by ng is wound through the guide eye 22. -, in the pivot sections 15 of the connecting rods 14. When the shaft 3 is pressed in, the conical surface of the pipe makes the sliding slide. n i her 1-2

the winding of the thread down along the axis of the drum in the direction of decreasing diameter also forced the windings of the thread lower on the drum to fall. This is facilitated by the fact that the remaining threads on the drum, the number of which is 6-9, are located on the conical part of the drum with an angle of inclination to the axis of rotation / of 1-2 °. Due to the small angle of inclination, the coils easily slide down, while at the same time, their coiling does not disturb the mutual position and does not trap the coils previously wound on the drum thereafter. The thread from the first turn from the bottom from the drum, touching the surface 20 of the disk 18, leaves the drum, passes under the machine stop lever 28 when the thread breaks through the guide eyes 23, 24 and enters the yarn guide in the hall system. When the thread 25 is broken at the entrance or exit of the device, the levers 27, 28 stops fall and close the electrical contact.

The machine stops. In order to change the diameter of the thread feeding drum on a stopped machine with an empty drum, overcoming the friction force of the spring 19, turn the disk 18 in the desired direction, which with its grooves

Claims (1)

The claims THREAD FEEDING DEVICE FOR A KNITTED MACHINE, comprising a drive pulley and a thread feeding drum rigidly mounted on the shaft, having the ability to change the diameter and including two flanges and thread feeding elements installed therein, and a disk mounted coaxially with the shaft with the possibility of rotation and fixing relative to the latter and having uniformly circumferential grooves for 17 rotates the connecting rods 14 to obtain the required diameter After adjusting the diameter of the drum, it is refilled with thread, Installed diameter The drum diameter is maintained during operation of the device by spring force 19 The technical advantage of the proposed device compared with the prototype device is to increase precise control of the filament feed speed while improving serviceability. Improving the accuracy of the control of the feed speed of the thread is carried out due to a more uniform yarn feed speeds to the limit of each revolution of the drum due to a more regular thread-feeding surface. Improving the convenience of service is achieved by simplifying the method of changing the diameter of the thread feeding drum and eliminating the stationary folding, making it difficult to refuel the device. In addition, the device does not impair the shape and strength of the supplied thread due to the fact that there is no sliding of the thread on the fixed surface of the spreader. (56) UK patent No. 2060007, CL D03 D 47/34, 1986. placing thread-feeding elements in them, characterized in that, in order to simplify the design and increase convenience in service, the thread feeding elements are made in the form of connecting rods and rotatably mounted in the flanges, and each of the connecting rods has two sections located at an angle to the axis of rotation; one of which is located at an angle of less than 90, and the other at an angle of no more than 2, while the disk is installed between the flanges and has a cylindrical section for smooth exit of the thread from the drum. eighteen 17 FIG. 1 Fig.Z